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  <head>
    <meta charset="utf-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta
      name="viewport"
      content="width=device-width, initial-scale=1, maximum-scale=1, minimum-scale=1, user-scalable=no"
    />
    <meta name="description" content="Manually control a model's animations." />
    <meta name="cesium-sandcastle-labels" content="Showcases" />
    <title>Cesium Demo</title>
    <script type="text/javascript" src="../Sandcastle-header.js"></script>
    <script
      type="text/javascript"
      src="../../../Build/CesiumUnminified/Cesium.js"
      nomodule
    ></script>
    <script type="module" src="../load-cesium-es6.js"></script>
  </head>
  <body class="sandcastle-loading" data-sandcastle-bucket="bucket-requirejs.html">
    <style>
      @import url(../templates/bucket.css);
    </style>
    <div id="cesiumContainer" class="fullSize"></div>
    <div id="loadingOverlay"><h1>Loading...</h1></div>
    <div id="toolbar"></div>
    <script id="cesium_sandcastle_script">
      window.startup = async function (Cesium) {
        "use strict";
        //Sandcastle_Begin
        const viewer = new Cesium.Viewer("cesiumContainer", {
          shouldAnimate: true,
        });

        //Make sure viewer is at the desired time.
        const start = Cesium.JulianDate.fromDate(new Date(2018, 11, 12, 15));
        const totalSeconds = 30;
        const stop = Cesium.JulianDate.addSeconds(
          start,
          totalSeconds,
          new Cesium.JulianDate(),
        );
        viewer.clock.startTime = start.clone();
        viewer.clock.stopTime = stop.clone();
        viewer.clock.currentTime = start.clone();
        viewer.clock.clockRange = Cesium.ClockRange.LOOP_STOP;
        viewer.timeline.zoomTo(start, stop);

        // Create a path for our model by lerping between two positions.
        const position = new Cesium.SampledPositionProperty();
        const distance = new Cesium.SampledProperty(Number);
        const startPosition = new Cesium.Cartesian3(
          -2379556.799372864,
          -4665528.205030263,
          3628013.106599678,
        );
        const endPosition = new Cesium.Cartesian3(
          -2379603.7074103747,
          -4665623.48990283,
          3627860.82704567,
        );
        // A velocity vector property will give us the entity's speed and direction at any given time.
        const velocityVectorProperty = new Cesium.VelocityVectorProperty(position, false);
        const velocityVector = new Cesium.Cartesian3();

        const numberOfSamples = 100;
        let prevLocation = startPosition;
        let totalDistance = 0;
        for (let i = 0; i <= numberOfSamples; ++i) {
          const factor = i / numberOfSamples;
          const time = Cesium.JulianDate.addSeconds(
            start,
            factor * totalSeconds,
            new Cesium.JulianDate(),
          );

          // Lerp using a non-linear factor so that the model accelerates.
          const locationFactor = Math.pow(factor, 2);
          const location = Cesium.Cartesian3.lerp(
            startPosition,
            endPosition,
            locationFactor,
            new Cesium.Cartesian3(),
          );
          position.addSample(time, location);
          distance.addSample(
            time,
            (totalDistance += Cesium.Cartesian3.distance(location, prevLocation)),
          );
          prevLocation = location;
        }

        function updateSpeedLabel(time, result) {
          velocityVectorProperty.getValue(time, velocityVector);
          const metersPerSecond = Cesium.Cartesian3.magnitude(velocityVector);
          const kmPerHour = Math.round(metersPerSecond * 3.6);

          return `${kmPerHour} km/hr`;
        }

        // Add our model.
        try {
          const modelPrimitive = viewer.scene.primitives.add(
            await Cesium.Model.fromGltfAsync({
              url: "../../SampleData/models/CesiumMan/Cesium_Man.glb",
              scale: 4,
            }),
          );

          modelPrimitive.readyEvent.addEventListener(() => {
            modelPrimitive.activeAnimations.addAll({
              loop: Cesium.ModelAnimationLoop.REPEAT,
              animationTime: function (duration) {
                return distance.getValue(viewer.clock.currentTime) / duration;
              },
              multiplier: 0.25,
            });
          });

          const rotation = new Cesium.Matrix3();
          viewer.scene.preUpdate.addEventListener(function () {
            const time = viewer.clock.currentTime;
            const pos = position.getValue(time);
            const vel = velocityVectorProperty.getValue(time);
            Cesium.Cartesian3.normalize(vel, vel);
            Cesium.Transforms.rotationMatrixFromPositionVelocity(
              pos,
              vel,
              viewer.scene.globe.ellipsoid,
              rotation,
            );
            Cesium.Matrix4.fromRotationTranslation(
              rotation,
              pos,
              modelPrimitive.modelMatrix,
            );
          });
        } catch (error) {
          window.alert(error);
        }

        const modelLabel = viewer.entities.add({
          position: position,
          orientation: new Cesium.VelocityOrientationProperty(position), // Automatically set the model's orientation to the direction it's facing.
          label: {
            text: new Cesium.CallbackProperty(updateSpeedLabel, false),
            font: "20px sans-serif",
            showBackground: true,
            distanceDisplayCondition: new Cesium.DistanceDisplayCondition(0.0, 100.0),
            eyeOffset: new Cesium.Cartesian3(0, 7.2, 0),
          },
        });
        viewer.trackedEntity = modelLabel;
        modelLabel.viewFrom = new Cesium.Cartesian3(-30.0, -10.0, 10.0);
        //Sandcastle_End
      };
      if (typeof Cesium !== "undefined") {
        window.startupCalled = true;
        window.startup(Cesium).catch((error) => {
          "use strict";
          console.error(error);
        });
        Sandcastle.finishedLoading();
      }
    </script>
  </body>
</html>
